ifferentiated by the cochlea by their frequency, which is determined by their wavelength divided by the speed of sound (Kurtus). The sound which is heard is made up of different frequencies, which determine their pitch. Humans and other animals can only hear within a limited range of pitches, which varies with the species.
25.6 The vestibular system, consisting of three semicircular canals, the utricle, and the saccule, lies in the inner ear (How). The canals are filled with endolymph, and each of the semicircular canals lies in a different anatomical plane at right angles to the others. This means each can sense movement in a different plane. When the head is tilted, the endolymph in the canals moves, and it stimulates the hair cells, sending nerve impulses to the brain. The ends of the semicircular canals connect with the utricle and the saccule, and hair cells in these two parts of the vestibular organ provide information on head posit
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